Fix a bug in function registry, improve docs

luprex/core/cpp/util.cpp

@@ -177,6 +177,24 @@ StringVec split_lines(const std::string &s) {
     return result;
 }
 
+StringVec split_docstring(const std::string &s) {
+    StringVec result;
+    int start = 0;
+    for (int i = 0; i < int(s.size()); i++) {
+        if (s[i]=='|') {
+            int len = i-start;
+            if ((len > 0)||(start > 0)) {
+                result.push_back(s.substr(start, i-start));
+            }
+            start = i + 1;
+        }
+    }
+    if (start < int(s.size())) {
+        result.push_back(s.substr(start, s.size()-start));
+    }
+    return result;
+}
+
 std::string join(const StringVec &strs, const std::string &sep) {
     if (strs.empty()) return "";
     std::ostringstream oss;